[p1mrx]

Over time, ISPs are pushing more users to IPv6 + CGNATv4 because they don't have enough IPv4 addresses.

If an internet service needs to distinguish users by IP address, say for spam fighting reasons, then IPv6 will provide finer granularity because the addresses are not shared by multiple users. Depending on how the ISP implements CGNAT, IPv6 may also improve performance and geolocation accuracy.

(They'd also be doing those ISPs a favor, because offloading traffic to IPv6 lowers the operating costs of CGNAT.)